Sent from my mobile. Enjoy.
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Alignment pins are cut in 4 quadrants and then the kerfs are closed up by bending the tabs that are formed by the cuts resulting in a tapered pin to ease assembly 

Emery cloth and filing is required to deburr the pin and smooth the surfaces 

Four holes in each end of the modules with the pins in the left hand holes of each pair of holes. When joined each modules is aligned with 4 pins making for a precise and rigid joint. Pin location is relative to the RAILHEAD'slocation so rails are brought to the edge of the module and are aligned to within thousandths of an inch

Sent from my mobile. Enjoy.
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Sent from my mobile. Enjoy.
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Sent from my mobile. Enjoy.
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Update

This is an under construction shot of the 18ft straight module set 

that will become Garden City CO-OP. At this point nearly all the roadbed is down on the 3 modules. The two end modules are operational now (2015 update) 

6ft straight S&SSofKS module

We be modulating ! Boy howdy !

Da modules ! Da modules !

Sharing a few pics from the weekend's activities indexed by the last 4 numbers on the file name.

1022 - an overhead shot of the space available to fill with modules - a former Masonic Lodge meeting room.

0529 - 45 deg 8ft OS curve # 6 - need to glue in four more pieces and it will be ready for the waffle bottom. 
A 45deg curved Speed-mo module can be seen in the upper right hand corner of this photo.

0418 - 45 deg 8ft OS curve # 5 - ready for the waffle bottom

0302 - 6ft Depressed center flat - on legs today - some cleanup to do in the trimming department
it's mate may be seen in the upper center of the overhead shot. Has a 45deg curved module top/bottom lying on top of it.

3427 - 45 deg 8ft OS curve # 4 - ready for the waffle bottom -- this one fully assembled in the RV !

Will get started this week on the last pair of 45deg curves required to complete the 360 degrees of curvature.

All for now

Mike the Modulist